JQuery中Bind()事件用法分析_jquery
这篇文章主要介绍了JQuery中Bind()事件用法,实例分析了Bind()事件的功能、特点与绑定事件时的使用技巧,需要的朋友可以参考下
本文实例分析了JQuery中Bind()事件用法。分享给大家供大家参考。具体分析如下：
我们先看一下它的定义：
.bind( eventType [, eventData], handler(eventObject))
.Bind()方法的主要功能是在向它绑定的对象上面提供一些事件方法的行为。期中它的三个参数的意义分别如下：
eventType是一个字符串类型的事件类型，就是你所需要绑定的事件。这类类型可以包括如下：blur, focus, focusin, focusout, load, resize, scroll, unload, click, dblclick, mousedown, mouseup, mousemove, mouseover, mouseout, mouseenter, mouseleave, change, select, submit, keydown, keypress, keyup, error 。这里需要注意的是，这里用的都是javascript里面的事件方法，而不是JQuery里面的，JQuery里面的事件方法均在JavaScript 前面多了一个“on”，比如onclick,onblur 等等。
eventData参数是一个可选参数，不过它在平时用的比较少。如果提供了这个参数，那么我们就能把一些附加信息传递给事件处理函数了。这个参数有个很好的用处，就是处理闭包带来的问题。待会在给大家举实例。
Handler是用来绑定的处理数，其实也也就是回调函数，处理完数据之后相应的方法。
1.第一个简单的bind ()事件---Hello Word
<input id="BtnFirst"type="button"value="Click Me"/>
<script>
$(function () {
$("#BtnFirst").bind("click",function(){
alert("Hello World");
});
})
</script>打开页面之后，点击按钮“Click Me”，就会弹出”Hello World”。这算是我们最简单的绑定事件吧。很简单吧。
2.绑定多个事件
我们可以通过bind()来绑定多个事件（其实，这也就是JQuery以及Linq中非常有名的链式编程）。实现的主要功能就是当我们点击的时候，弹出“Hello World”，当离开button的时候，显示出一个p。
<p>
<input id="BtnFirst"type="button"value="Click Me"/></p>
<p id="Testp"style=" width:200px; height:200px; display:none; ">
</p>
<script>
$(function () {
$("#BtnFirst").bind("click", function () {
alert("Hello World");
}).bind("mouseout", function () {
$("#Testp").show("slow");
});
})
</script>这段代码页很容易理解，就是当button被点击的时候，弹出一个"Hello World"，在离开的时候，在把p给显示出来。JQuery里的动画，均可以用“slow”、“fast”和“normal”，当然你还可以设置相关的毫秒数。
3.bind()事件的对象
Handler这个回调函数可以接受一个参数，当这个函数被调用时，一个JavaScript事件对象会作为一个参数传进来。
给一个JQuery官网上面的例子：
<style>
p {background:yellow;font-weight:bold;cursor:pointer;3 padding:5px;}
p.over {background:#ccc;}
span {color:red;}
</style>
<p>Click or double click here.</p>
<span></span>
<script>
$("p").bind("click", function(event){
var str = "( " + event.pageX + ", " + event.pageY + " )";
$("span").text("Click happened! " + str);
});
$("p").bind("dblclick", function(){
$("span").text("Double-click happened in " + this.nodeName);
});
$("p").bind("mouseenter mouseleave", function(event){
$(this).toggleClass("over");
});
</script>这里的主要功能是为了实现当用户点击p这个对象的时候，把当前相对于页面的坐标显示在span标签里面，这里就用到了event这个事件。把参数传进去。
4.unbind()事件
unbind([type],[data]，Handler) 是 bind()的反向操作，从每一个匹配的元素中删除绑定的事件。如果没有参数，则删除所有绑定的事件。你可以将你用bind()注册的自定义事件取消绑 定。如果提供了事件类型作为参数，则只删除该类型的绑定事件。如果把在绑定时传递的处理函数作为第二个参数，则只有这个特定的事件处理函数会被删除。
<body onclick="MyBodyClick()">
<p onclick="MyClickOut()">
<p onclick="MyClickInner()">
<span id="MySpan">I love JQuery!! </span>
</p>
</p>
<span id="LooseFocus">失去焦点</span>
</body>
<script>
function MyClickOut() {
alert("outer p");
}
function MyClickInner() {
alert("Inner p");
}
function MyBodyClick() {
alert("Body Click");
}
var foo = function () {
alert("I'm span.");
}
$(function () {
$("#MySpan").bind("click", foo);
})
$(function () {
$("#LooseFocus").unbind("click", foo);
})
</script>上面的代码也很好理解，就是当用户的鼠标在span上面停留的时候，然后把span的click事件给取消掉。所以，最后它只会弹出body里面的alert。
最后，简单的了解一下one()事件的使用，其实one和bind是一样，都是为了绑定事件而产生的。One与bind基本上差不多，不同的在调用 jQuery.event.add时，把注册的事件处理的函数做了一个小小的调整。One调用了jQuery.event.proxy进行了代理传入的事 件处理函数。在事件触发调用这个代理的函数时，先把事件从cache中删除，再执行注册的事件函数。这里就是闭包的应用，通过闭包得到fn注册的事件函数 的引用。
使用规则：
one(type,[data],fn)
为每一个匹配元素的特定事件（像click）绑定一个一次性的事件处理函数。 在每个对象上，这个事件处理函数只会被执行一次。其他规则与bind()函数相同。这个事件处理函数会接收到一个事件对象，可以通过它来阻止（浏览器）默认的行为。如果既想取消默认的行为，又想阻止事件起泡，这个事件处理函数必须返回false。
贴一下，bind和one的各自代码的实现,看官可以稍微的做一个比较：
Bind()代码的实现：
bind : function(type, data, fn) {
return type == "unload" ? this.one(type,data,fn) : this.each(function(){
//fn || data, fn && data实现了data参数可有可无
jQuery.event.add(this, type, fn || data, fn && data);
});
}One()代码的实现：
one : function(type, data, fn) {
var one = jQuery.event.proxy(fn || data, function(event) {
jQuery(this).unbind(event, one);
return (fn || data).apply(this, arguments);
//this->当前的元素
});
return this.each(function() {
jQuery.event.add(this, type, one, fn && data);
});
}5.最后呢，其实想在贴一个冒泡事件，因为在处理绑定事件的时候，如果调用内部的事件 有可能会触发外面的事件，所以给大伙一个借鉴吧。
这里可以参考一下javascript事件冒泡的文章：《JavaScript 事件冒泡简介及应用》。
简单的说，何为冒泡事件？其实，简单的理解是，也可以说是事件传播，它会从内部的控件广播到父类的元素，然后接着一直往上到祖先级别的元素。
则 冒泡实例代码：
<body onclick="MyBodyClick()">
<p onclick="MyClickOut()">
<p onclick="MyClickInner()">
<span id="MySpan">
I love JQuery!!
</span>
</p>
</p>
</body>
<script type="text/javascript">
function MyClickOut() {
alert("outer p");
}
function MyClickInner() {
alert("Inner p");
}
function MyBodyClick() {
alert("Body Click");
}
$(function () {
$("#MySpan").bind("click", function (event) {
alert("I'm span");
event.stopPropagation();
});
</script>
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